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A local courier service sends packages to Oakland and offers a money back guarantee that each package will be delivered within 24 hours. The courier service sends 70% of packages by plane, 20% by train, and10% by van. If a package is sent by airplane, the probability it is delivered within 24 hours is 0.96. For packages sent by train and van, the probability they are delivered within 24 hours are 0.92 and 0.87,respectively.
(a) What proportion of the time will the courier service meet its guaranteed delivery time?
(b) If a package fails to reach Oakland within 24 hours, what is the probability it was sent by train? (with all steps please)
A random sample of 43 light bulbs has a mean life of 677 hours with a standard deviation of 90 hours. Do you have enough evidence to reject the manufacturer's claim?
1. of 1906 people who came into a blood bank to give blood 300 people had high blood pressure. estimate the probability
Construct confidence intervals for the estimates of the slope coefficients in (i) to (iii) of Question 3. Explain the meaning of these confidence intervals and comment on your results about the width of the confidence intervals, if sample size inc..
an io psychologist asks employees to complete surveys measuring job satisfaction and organizational citizenship
Explain how random events behave in the short run and in the long run and how random and haphazard are not the same thing.
Using the information in question 1 and assuming a 50 percent chance of either scenario occurring, determine the expected value of the effective financing rate.
Suppose we play a game where we start with c dollars. On each play of the game you either double or halve your money, with equal probability. What is your expected fortune after n trials?
What is the best point estimate of the mean weight of babies born to mothers who did not use cocaine during their pregnancies?
(a) Show that E [X(X - 1)] = µ(µ - 1) + σ 2 (b) Show that E [(X - c) 2 ] = (µ - c) 2 + σ 2 where c is an arbitrary constant.
An aquarium tank can hold 7700 liters of water. There are two pipes that can be used to fill the tank. The first pipe alone can fill the tank in 77 minutes.
in a study the data you collect is status of disease infection.in a study the data you collect is favorite type of
The mayor of a small town would like to know whether a local bond issue is likely to pass or not. He mails a survey to 500 randomly selected voters.
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